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Snow Controller IOM manual
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We manage heat
Model EUR5ASnow and Ice Melting Control
Part Number 21496
Installation and Operation Manual
Environmental Technology, Inc.1850 N Sheridan StreetSouth Bend, Indiana 46628(574) 233-1202 or (800) 234-4239FAX (574) 233-2152 or (888) 234-4238http://www.networketi.com/
DISCLAIMEREnvironmental Technology, Inc. makes no representations or warranties, either expressed or implied, with respect to the contents of this publication or the products that it describes, and specifically disclaims any implied warranties of merchantability or fitness for any particular purpose. Environmental Technology, Inc. reserves the right to revise this publication and to make changes and improvements to the products described in this publication without the obligation of Environmental Technology, Inc. to notify any person or organization of such revisions, changes or improvements.
Copyright 2008 Environmental Technology, Inc. All rights reserved. No part of this manual may be reproduced or translated in any form or by any means, electronic or mechanical including photocopying and recording, for any purpose without the express written consent of Environmental Technology, Inc.
The ETI logo, We Manage Heat, CIT, GIT, and SIT are reg is tered trademarks of En vi ron men tal Technology, Inc. EUR and RCU are trademarks of Environmental Technology, Inc.
PN21776 rev B 11/08Printed in USA
Page 3 of 27
Table of ContentsSafety 7Contacting Environmental Technology 7
General 7Introduction 7Environmental Interfaces 8Building Energy Management Computer (BEMC) Interface 9Operator Interfaces 9
EUR5A Front Panel 9Pushbutton Switch 9RCU3 Remote Control Unit 9
Power Source 10Contactor Interface 10Specifi cations 10
Operation 12Local Control from the EUR5A 12Remote Control from the RCU3 12Remote Control from the BEMC 13Panel-Mounted Switch 13
Installation 14First 14Next 14Pro Forma Packing List 14Location 14Mechanical 14Connections 14
Safety Information 14Power Source and Contactor Connections 14Environmental Sensors Connections 17Temperature Limit Sensor Connections 17RCU3 Remote Control Connections 18BEMC Interface Connections 18Heater Cycle Switch Connections 19
Continued...
Page 4 of 27
Maintenance 20General 20Troubleshooting 20Returns 20
Table of Contents
Page 5 of 27
Index of FiguresFigure 1. Typical EUR5A installation. 8Figure 2. EUR5A 15Figure 3. Power and contactor connections. 16Figure 4. Sensor connections for a typical pavement snow melting application. 16Figure 5. Temperature limit sensor connection. 17Figure 6. RCU3 Remote Control connection. 18Figure 7. BEMC interface connection. 18Figure 8. Heater cycle switch connection. 19Appendix A. Typical EUR5A Installation. 21Appendix B. EUR5A 22Appendix C. Power and Contactor Connections. 23Appendix D. Sensor Connections, Typical. 24Appendix E. Temperature Limit Sensor Connections. 25Appendix F. RCU3 Remote Control Connections. 26Appendix G. Heater Cycle Switch Connections. 27
Page 6 of 27
Page 7 of 27
SafetyMake all electrical connections in compliance with the National Electric Code (NFPA 70)
and local electrical code. If you have questions concerning the installation or application, contact Customer Service.
Contacting Environmental TechnologyFor assistance, contact Customer Service. Office hours are 8:00 AM until 5:00 PM EST.
Voice: (800) 234.4239 (USA and Canada) or (574) 233.1202 (elsewhere)
Fax: (888) 234.4238 (USA and Canada) or (574) 233.2152 (elsewhere)
E-mail: [email protected]
Mail: Environmental Technology, Inc.
1850 North Sheridan Street
South Bend, IN 46628
GeneralIntroduction
The EUR5A Snow and Ice Melting Control is the interface between environmental sensors, building energy management computer (if present), operating personnel and the heater control contactors. Figure 1 shows a typical snow melting system using an EUR5A. Currently, compatible environmental sensors are available for pavement, aerial and gutter snow and ice melting applications. A special sensor measures ambient temperature.
Using at least two environmental sensors, as shown in Figure 1, improves performance through superior coverage. A single environmental sensor can miss tracked or blowing and drifting snow. The first environmental sensor detecting snow or ice starts the heaters. When both environmental sensors become clear of snow and ice, the heater hold-on interval begins. The EUR5A accommodates up to eight environmental sensors.
During hold-on, heater operation continues for an adjustable time interval.
This serves the purposes of melting any accumulated snow and ice and drying the pavement. Re-freezing can create hazardous conditions.
The EUR5A includes an adjustable high temperature limit thermostat. This feature is useful in systems using MI cable and other constant wattage heaters to prevent excessive temperatures. When using self-limiting heaters, this feature can be defeated.
Typically, the EUR5A is located in an electrical enclosure housing heater contactors
Page 8 of 27
which is not convenient for operating personnel or accessible to laymen. Supervisory control is sometimes necessary due to the need for testing and unusual environmental conditions which can include blowing, drifting and tracked snow. The EUR5A itself provides control and indicators for this purpose. However, accessing them requires opening the electrical enclosure thus exposing lethal voltages. This problem is avoided through the use of the RCU3 Remote Control Unit which is included. Another simple alternative is to mount a customer supplied pushbutton switch in the electric panel door for cycling the hold-on timer.
Environmental InterfacesThe EUR5A determines when to start heater operation by monitoring the signals produced
by up to six environmental customer supplied sensors paralleled together using a three-wire bus. Available sensors include:
SIT6E Pavement Mounted Snow and Ice Sensor CIT1 Aerial Snow and Ice Sensor GIT1 Gutter Snow and Ice Sensor
The EUR5A includes a temperature sensor for measuring air or pavement slab
RCU3Remote Control
TemperatureLimit Sensor
Must be installed for proper operation.
CIT1Aerial Snow Sensor
SIT6EPavement-Mounted Sensor
EUR5ASnow Switch
EquipmentGround
Building/EnergyManagement
Computer Interface
RemoteHeaterCycle
Contacts
CR-1-1
CR-1CR-2
120 VAC50 VA
HeaterControl
Contactor
AuxiliaryRelay
Figure 1. Typical EUR5A installation.
Page 9 of 27
temperature. This sensor is required for proper operation of the unit. Its signal is used to provide an adjustable high limit thermostat function. This feature is essential when using a potentially high temperature heater such as MI cable.
Building Energy Management Computer (BEMC) InterfaceThe EUR5A interfaces a BEMC via relays. Inputs from the BEMC include: OVERRIDE
ON which causes heater operation and OVERRIDE OFF which inhibits heater operation. These functions are independent of weather conditions and the status of the hold-on timer. The EUR5A provides three system status contact closures for the BEMC including SUPPLY, SNOW and HEATER. The SUPPLY relay contact closes on the absence of power since it is reverse acting.
Absent signals from the BEMC, the EUR5A controls the heaters based upon environmental conditions. Automatic snow melting control is the default condition of the system.
Operator InterfacesEUR5A Front Panel
The EUR5A has indicators, adjustments, and a switch for local control of the snow melting system. These include:
SUPPLY indicator SNOW indicator HEAT indicator HEATER CYCLE pushbutton switch HOLD-ON time adjustment with a range of 0 to 10 hours and off HIGH-LIMIT temperature adjustment with a range of 40 to 90 F (4 to 32 C)
Figure 2 shows the EUR5A front panel layout.
Pushbutton SwitchThe EUR5A provides an interface for a customer-supplied pushbutton switch which
initiates the hold-on timer for the interval set by the EUR5A. This switch also resets the hold-on timer if it is running. Typically, this switch is located on the door of the electrical enclosure. This feature is optional.
RCU3 Remote Control UnitEach EUR5A includes an RCU3 for monitoring the snow melting and controlling
system operation from a convenient observation point. This accommodates unusual environment conditions that could result in heater operation being terminated before the snow was completely cleared and the pavement dry. The RCU3 provides both a heater hold-on switch and an
Page 10 of 27
independent hold-on time interval adjustment.
The RCU3 provides the following indicators, switches and adjustments: POWER indicator (green) HEATER indicator (yellow) HEATER CYCLE switch HOLD-ON time adjustment (two to eight hours in two hour steps)
Figure 3 shows the front panel layout. The Class 2 for wet locations RCU3 mounts in a single gang switch box up to 500 feet from the EUR5A at a location convenient for observing snow melting system operation.
Power SourceThe EUR5A operates from a 24 volt AC NEC Class 2 power source. A 120 to 24 volt 50
VA control transformer is included for this purpose.
Contactor InterfaceSince the EUR5A is a NEC Class 2 device, it usually requires a customer supplied
auxiliary relay for operating the heater control contactor solenoids.
Specifi cationsEnvironmental Interfaces
Environmental Sensors Up to 6 sensors from the CIT1/GIT1/SIT6E family.Temperature Limit Sensor ETI P/N 19272 Thermistor Temperature Sensor. Locate up to 2,000' (610 meters) from
the EUR5A. Can be eliminated by substituting a fixed resistor for the P/N 19272 (contact Customer Service for additional information)
Building Energy Management InterfaceInputs are relay coils operating from 5 VDC at 0.05 amps (nominal) OVERRIDE ON OVERRIDE OFFOutputs are relay contacts rated at up to 24 VAC or VDC at 0.05 amps SUPPLY SNOW HEAT
Page 11 of 27
Operator InterfacesEUR5A Snow and Ice Melting Control Indicators SUPPLY
SNOWHEAT
Adjustments HOLD-ON TIME: 0 to 10 hoursHIGH-LIMIT TEMPERATURE: 40 to 90F (4 to 32C) with a 0.5 F ( 0.3C) dead-band
Control HEATER CYCLE: operates heaters for the hold-on time
Panel-mounted Switch Electrical interface for a SPST dry-circuit panel-mounted switch
RCU3 Remote Control Unit Locate up to 500' (152 Meters) from the EUR5A Indicators SUPPLY
HEAT Adjustment HOLD-ON TIME: 2 to 8 hours Control HEATER CYCLEContactor Interface SPDT Class 2 pilot duty relay contact rated at 1 ampPower Requirements NEC Class 2 source of 24 VAC 2 volt-amps (nominal)Temperature Ranges Operating: 40F (40C) to +140F (+60C) Storage: 67F (55C) to +167F (+75C)Mechanical NEMA 1 housing 35 MM DIN rail or bulkhead mounting Size is 4" W by 47/8" D by 3" H
Page 12 of 27
OperationThe snow melting system can be monitored and controlled either locally from the EUR5A
itself or from two remote locations including: RCU3 Remote Control Unit BEMCA third remote option uses a customer-supplied switch to toggle the heaters on for the hold-
on time from the front panel of the electrical enclosure.
Local Control from the EUR5AIndicators:
SUPPLY (green) shows that power is present SNOW (yellow) shows that it is snowing HEAT (yellow) shows that there is a call for heat. This happens during snow and for
the hold-on time thereafter or when the heater cycle switch is operated. Please note, if thermistor temperature exceeds the setting on the temperature limit dial, the heaters will shut off; the hold-on timer remains active.
Adjustments: HOLD-ON TIME adjustment sets the time that heaters operate after snow stops. Doing
this is necessary to make certain the pavement dries before heating ceases. This prevents re-freezing. Try an initial setting of 5 hours. Increase, if necessary. Reduce with care since energy savings are being traded for an increased likelihood of re-freezing.
HIGH-LIMIT TEMPERATURE adjustment sets the maximum deicing temperature.
Remote Control from the RCU3The location for the RCU3 is chosen for convenient observation of snow melting system
operation. It monitors snow melting and permits overriding automatic control in the event that heating terminates before the pavement is dry. The SUPPLY indicator shows that power is available for the snow melting system while the HEAT indicator operates with the snow melting heaters.
The HOLD-ON TIME adjustment sets the heater operating time in a 2 to 8 hour range. The range of this adjustment is independent of its equivalent on the EUR5A for flexibility.
Operating the HEATER CYCLE switch causes snow melting heater operation for the HOLD-ON TIME adjustment setting. Using this switch during hold-on turns the heaters off.
If the heaters turn off before the pavement is dry, operate the HEATER CYCLE switch. This continues heater operation for the HOLD-ON TIME. A trial HOLD-ON TIME of 4 hours is suggested. If the pavement dries during the hold-on interval, operate the HEATER CYCLE
Page 13 of 27
switch to turn the heaters off. Adjust the HOLD-ON TIME in steps of plus or minus two hours to optimize heater operation.
Remote Control from the BEMCOperation of this interface is defined in the Specifications section of this manual.
Panel-Mounted SwitchOperating this switch initiates heater operation for the hold-on time set by the EUR5A. If
operated during the hold-on time, heater operation is terminated.
Page 14 of 27
InstallationFirst
Inspect the package and its contents for damage. In the event of damage, immediately contact Environmental Technology, Inc. Customer Service.
NextCheck the contents of the package against the pro forma Packing List shown below. If
discrepancies are found, contact ETI Customer Service before starting the installation.
Pro Forma Packing ListOrder Number Quantity Description
21496 1 EUR5A Snow and Ice Melting Control19272 1 Temperature Limit Sensor14257 1 Power Transformer, 50 VA21357 1 RCU3 Remote Control21776 1 EUR5A Installation and Operation Manual
LocationThe EUR5A requires a protected unheated location suitable for a NEMA1 enclosure. The
electric panel housing the heater control contactors is an ideal location.
MechanicalFigure 2 shows a mechanical outline drawing of the EUR5A. It mounts in 35 MM DIN
rail (customer supplied). Optionally, the DIN rail locking mechanism can be removed from the bottom of the enclosure for direct panel mounting. For convenience, leave a generous space for wiring connections.
ConnectionsSafety Information
The EUR5A is a NEC Class 2 device as are the sensors and remote control accessory devices. The electric panel location creates exposure to lethal voltages. Make certain that the installation adheres to applicable sections of the NEC.
Power Source and Contactor ConnectionsFigure 3 shows power and contactor connections for a typical installation. If your
Page 15 of 27
HOURS0
2
4 6
8
10
TEMPERATURE
40F 90F
50F
60F 70F
80 F
HEATERCYCLE
South Bend, Indiana 46601www.networketi.com
EUR5A Snow SwitchAutomatic Snow/Ice Melting Control PanelPart Number 21496
24 V
AC Re
turn
24 V
ACNo
Con
nec
tion
No C
onn
ectio
nNo
Con
nec
tion
No C
onn
ectio
nNo
Con
nec
tion
No C
onn
ectio
nRe
mot
e He
ater
Togg
le Re
turn
Rem
ote
Heat
er To
ggle
No C
onn
ectio
nSe
nso
r Pow
er (R
ed)
Sen
sor S
ign
al (W
hite
)Se
nso
r Gro
und
(Blac
k)No
Con
nec
tion
Con
trol R
elay
Com
mon
Con
trol R
elay
NO
No C
onn
ectio
n
Con
trol R
elay
NC
38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20
Equipment Ground
No Con
nection
EMC Heater On
EMC Sno
w Present
EMC Supply Present
EMC Output C
om
mon
EMC O
verride Off
EMC O
verride OnEM
C Input Co
mm
on
No Con
nection
No Con
nection
No Con
nection
No Con
nection
Remote
Co
ntrol ReturnRem
ote Co
ntrolNo C
onn
ection Tem
perature Sensor Return
Equipment Ground
Temperature Sen
sor
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
Figure 2. EUR5A
Page 16 of 27
CR-1-1CR-1
CR-2
120 VAC50 VA
HeaterControl
Contactor
AuxiliaryRelay
24 V
24 V
olts
Aol
ts A
C R
etur
C R
etur
n
24 V
24 V
olts
Aol
ts A
C
No
Con
nect
ion
No
Con
nect
ion
No
Con
nect
ion
No
Con
nect
ion
No
Con
nect
ion
No
Con
nect
ion
Rem
ote
Hea
ter
Togg
le R
etur
n
Rem
ote
Hea
ter
Togg
le
No
Con
nect
ion
Sen
sor
Sup
ply
(Red
)
Sen
sor
Sup
ply
(Whi
te)
Sen
sor
Sup
ply
(Bla
ck)
No
Con
nect
ion
Con
trol
Rel
aC
ontr
ol R
elay
Com
mon
y C
omm
on
Con
trol
Rel
aC
ontr
ol R
elay
NO
y N
O
No
Con
nect
ion
Con
trol
Rel
aC
ontr
ol R
elay
NC
y N
C
38 3737 3636 35 34 33 32 31 30 29 28 27 26 25 24 23 2222 2121 2020
Pow
er
Red
White
Black
Red
White
Black
Red
Whi
te
Bla
ck
24 V
AC
Ret
urn
24 V
AC
No
Con
nect
ion
No
Con
nect
ion
No
Con
nect
ion
No
Con
nect
ion
No
Con
nect
ion
No
Con
nect
ion
Rem
ote
Hea
ter
Togg
le R
etur
n
Rem
ote
Hea
ter
Togg
le
No
Con
nect
ion
Sen
sor
24 V
AC
(Red
)
Sen
sor
Sig
nal (
Whi
te)
Sen
sor
Gro
und
(Bla
ck)
No
Con
nect
ion
Con
trol
Rel
ay C
omm
on
Con
trol
Rel
ay N
O
No
Con
nect
ion
Con
trol
Rel
ay N
C
38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20
CIT1Aerial Snow Sensor
SIT6EPavement-Mounted Sensor
Pow
er
Figure 3. Power and contactor connections.
Figure 4. Sensor connections for a typical pavement snow melting application.
Page 17 of 27
installation is atypical, Customer Service is available for assistance at no cost.
Environmental Sensors ConnectionsFigure 4 shows connections for a typical pavement snow melting application using both a
CIT1 Aerial Snow Sensor and a SIT6E Embedded Sensor. Up to six sensors can be used with a single EUR5A. Use #18 AWG extension wire for distances up to 250' and #14 for up to 1,000'. Running sensor and line voltage wiring in the same conduit is not recommended.
Ambient/Slab Temperature Sensor Connections
Temperature Limit SensorETI P/N 19272
Eq
uipm
ent Ground
No C
onnection
EM
C H
eater On
EM
C S
now P
resent
EM
C S
upp
ly Present
EM
C O
utput C
omm
on
EM
C O
verride O
ff
EM
C O
verride O
n
EM
C Inp
ut Com
mon
No C
onnection
No C
onnection
No C
onnection
No C
onnection
Rem
ote Control R
eturn
Rem
ote Control
No C
onnection
T Temp
erem
perature S
ensor Retur
ature Sensor R
eturn
Eq
uipm
ent Ground
Temp
erem
perature S
ensorature S
ensor
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
2,000' (609.6m) max, 20' (6m) supplied
No C
onnection
No C
onnection
Rem
ote Control R
eturn
Rem
ote Control
No C
onnection
T Temp
erem
perature S
ensor Retur
ature Sensor R
eturn
Temp
erem
perature S
ensorature S
ensor1 2 3 4 5 6
Figure 5. Temperature limit sensor connection.
NOTE: The Ambient/Slab Temperature Sensor or a 470 K ohm resistor is required across terminal 1 and 2 for the unit to properly operate.
Page 18 of 27
RCU3 Remote Control Connections
RCU3 Remote ControlETI P/N 21357
Eq
uipm
ent Ground
No C
onnection
EM
C H
eater On
EM
C S
now P
resent
EM
C S
upp
ly Present
EM
C O
utput C
omm
on
EM
C O
verride O
ff
EM
C O
verride O
n
EM
C Inp
ut Com
mon
No C
onnection
No C
onnection
No C
onnection
No C
onnection
Rem
ote Control R
eturR
emote C
ontrol Return
Rem
ote Control
Rem
ote Control
No C
onnection
Temp
erature Sensor R
eturn
Eq
uipm
ent Ground
Temp
erature Sensor
1 2 3 44 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
S3
R3
R2
R1
D2
YEL
D1
GRN
R4
J1
2,000' (609.6m) max, 20' (6m) supplied
Figure 6. RCU3 Remote Control connection.
BEMC Interface Connections
Eq
uipm
ent Ground
No C
onnection
EM
C H
eater On
EM
C H
eater On
EM
C S
noE
MC
Snow
Present
w P
resent
EM
C S
upp
ly Present
EM
C S
upp
ly Present
EM
C O
utput C
omm
onE
MC
Outp
ut Com
mon
EM
C O
vE
MC
Overrerrid
e Off
ide O
ff
EM
C O
vE
MC
Overrerrid
e On
ide O
n
EM
C Inp
ut Com
mon
EM
C Inp
ut Com
mon
No C
onnection
No C
onnection
No C
onnection
No C
onnection
Rem
ote Control R
eturn
Rem
ote Control
No C
onnection
Temp
erature Sensor R
eturn
Eq
uipm
ent Ground
Temp
erature Sensor
1 2 3 4 5 6 7 8 9 1010 1111 1212 1313 1414 1515 1616 17 18 19
BEMC
8
Figure 7. BEMC interface connection.
Page 19 of 27
Heater Cycle Switch ConnectionsRemote HeaterCycleSwitch
24 V
AC
Ret
urn
24 V
AC
No
Con
nect
ion
No
Con
nect
ion
No
Con
nect
ion
No
Con
nect
ion
No
Con
nect
ion
No
Con
nect
ion
Rem
ote
Hea
ter
TR
emot
e H
eate
r To
ggle
Ret
urog
gle
Ret
urn
Rem
ote
Hea
ter
TR
emot
e H
eate
r To
ggle
oggl
e
No
Con
nect
ion
Sen
sor
24VA
C (R
ed)
Sen
sor
Sig
nal (
Whi
te)
Sen
sor
Gro
und
(Bla
ck)
No
Con
nect
ion
Con
trol
Rel
ay C
omm
on
Con
trol
Rel
ay N
O
No
Con
nect
ion
Con
trol
Rel
ay N
C
38 37 36 35 34 33 32 31 30 2929 2828 27 26 25 24 23 22 21 20
Pow
er
Figure 8. Heater cycle switch connection.
Page 20 of 27
Maintenance General
The EUR5A contains no field replaceable components. Defective units must be returned to ETI for repair or replacement.
TroubleshootingAlthough the EUR5A is a relatively simple device electronically, troubleshooting is
complicated by the multiplicity of features provided by this product. Hence component-level troubleshooting in the field is not practical. Checking only basic functions is the correct approach. Contact Customer Service if this does not identify the problem.
First, check the installation for security. Make certain that all EUR5A terminal block screws are snugly tightened. Do not over-tighten! If this is a new installation, check for wiring errors and similar problems.
If none of the LEDs on the EUR5A front panel operate, check for 24 to 28 VAC between terminal block terminals 36 and 37. If the voltage is present, the EUR5A is defective.
If the "HEAT" LED is flashing it indicates that the Ambient/Slab Temperature Sensor is not properly connected. Check the sensor connection and replace the sensor if necessary.
The next tests determine whether a sensor or the EUR5A is defective. Remove EUR5A power. Turn temperature limit dial to 90; if ambient temperature is above 85, install 470k resistor in place of temperature limit thermistor. Remove the wire connected to terminal block terminal 25 which is the sensor signal connection. Re-apply EUR5A power. If the Control Relay operates, the EUR5A is defective. Connect a short jumper wire between terminal block terminals 25 (sensor signal) and 24 (sensor ground). The Control Relay should close within 10 seconds or the EUR5A is defective.
ReturnsContact Customer Service to obtain a Return Authorization before shipment to
Environmental Technology, Inc. Otherwise, the shipment may be refused.
Page 21 of 27
Appendix A. Typical EUR5A Installation.R
CU
3R
emot
e C
ontro
l
Tem
pera
ture
Lim
it S
enso
r
Mus
t be
inst
alle
d fo
r pr
oper
ope
ratio
n.
CIT
1A
eria
l Sno
w S
enso
r
SIT
6EP
avem
ent-M
ount
ed S
enso
EUR
5A
Sno
w S
witc
h
Equ
ipm
ent
Gro
und
Bui
ldin
g/E
nerg
yM
anag
emen
tC
ompu
ter I
nter
face
Rem
ote
Hea
ter
Cyc
leC
onta
cts
CR
-1-1
CR
-1C
R-2
120
VAC
50 V
A
Hea
ter
Con
trol
Con
tact
or
Aux
iliar
yR
elay
Page 22 of 27
HOURS0
2
4 6
8
10
TEMPERATURE
40F 90F
50F
60F 70F
80 F
HEATERCYCLE
South Bend, Indiana 46601www.networketi.com
EUR5A Snow SwitchAutomatic Snow/Ice Melting Control PanelPart Number 21496
24 V
AC Re
turn
24 V
ACNo
Con
nec
tion
No C
onn
ectio
nNo
Con
nec
tion
No C
onn
ectio
nNo
Con
nec
tion
No C
onn
ectio
nRe
mot
e He
ater
Togg
le Re
turn
Rem
ote
Heat
er To
ggle
No C
onn
ectio
nSe
nso
r Pow
er (R
ed)
Sen
sor S
ign
al (W
hite
)Se
nso
r Gro
und
(Blac
k)No
Con
nec
tion
Con
trol R
elay
Com
mon
Con
trol R
elay
NO
No C
onn
ectio
n
Con
trol R
elay
NC
38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20
Equipment Ground
No Con
nection
EMC Heater On
EMC Sno
w Present
EMC Supply Present
EMC Output C
om
mon
EMC O
verride Off
EMC O
verride OnEM
C Input Co
mm
on
No Con
nection
No Con
nection
No Con
nection
No Con
nection
Remote
Co
ntrol ReturnRem
ote Co
ntrolNo C
onn
ection Tem
perature Sensor Return
Equipment Ground
Temperature Sen
sor
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
Appendix B. EUR5A
Page 23 of 27
Appendix C. Power and Contactor Connections.
CR
-1-1
CR
-1
CR
-2
120
VAC
50 V
A
Hea
ter
Con
trol
Con
tact
or
Aux
iliar
yR
elay
24 V 24 Volts A olts AC Retur C Return
24 V 24 Volts A olts AC
No Connection
No Connection
No Connection
No Connection
No Connection
No Connection
Remote Heater Toggle Return
Remote Heater Toggle
No Connection
Sensor Supply (Red)
Sensor Supply (White)
Sensor Supply (Black)
No Connection
Control Rela Control Relay Common y Common
Control Rela Control Relay NO y NO
No Connection
Control Rela Control Relay NC y NC
383737
363635
3433
3231
3029
2827
2625
2423
22222121
2020
Power
Page 24 of 27
Appendix D. Sensor Connections, Typical.
Red
Whi
te
Bla
ck
Red
Whi
te
Bla
ck
Red
White
Black
24 VAC Return
24 VAC
No Connection
No Connection
No Connection
No Connection
No Connection
No Connection
Remote Heater Toggle Return
Remote Heater Toggle
No Connection
Sensor 24 VAC (Red)
Sensor Signal (White)
Sensor Ground (Black)
No Connection
Control Relay Common
Control Relay NO
No Connection
Control Relay NC
3837
3635
3433
3231
3029
2827
2625
2423
2221
20
CIT1
Aer
ial S
now
Sen
sor
SIT6E
Pav
emen
t-Mou
nted
Sen
sor
Power
Page 25 of 27
Appendix E. Temperature Limit Sensor Connections.
Tem
pera
ture
Lim
it S
enso
rE
TI P
/N 1
9272
Equipment Ground
No Connection
EMC Heater On
EMC Snow Present
EMC Supply Present
EMC Output Common
EMC Override Off
EMC Override On
EMC Input Common
No Connection
No Connection
No Connection
No Connection
Remote Control Return
Remote Control
No Connection
T Temperemperature Sensor Returature Sensor Return
Equipment Ground
Temperemperature Sensorature Sensor 12
34
56
78
910
1112
1314
1516
1718
19
2,00
0' (6
09.6
m) m
ax,
20' (
6m) s
uppl
ied
No Connection
No Connection
Remote Control Return
Remote Control
No Connection
T Temperemperature Sensor Returature Sensor Return
Temperemperature Sensorature Sensor 12
34
56
Page 26 of 27
Appendix F. RCU3 Remote Control Connections.
RC
U3
Rem
ote
Con
trol
ETI
P/N
213
57
Equipment Ground
No Connection
EMC Heater On
EMC Snow Present
EMC Supply Present
EMC Output Common
EMC Override Off
EMC Override On
EMC Input Common
No Connection
No Connection
No Connection
No Connection
Remote Control ReturRemote Control Return
Remote ControlRemote Control
No Connection
Temperature Sensor Return
Equipment Ground
Temperature Sensor 12
344
56
78
910
1112
1314
1516
1718
19
S3
R3
R2
R1
D2
YEL
D1
GRN
R4
J1
2,00
0' (6
09.6
m) m
ax,
20' (
6m) s
uppl
ied
Page 27 of 27
Appendix G. Heater Cycle Switch Connections.
Equipment Ground
No Connection
EMC Heater OnEMC Heater On
EMC SnoEMC Snow Presentw Present
EMC Supply PresentEMC Supply Present
EMC Output CommonEMC Output Common
EMC OvEMC Overrerride Offide Off
EMC OvEMC Overrerride Onide On
EMC Input CommonEMC Input Common
No Connection
No Connection
No Connection
No Connection
Remote Control Return
Remote Control
No Connection
Temperature Sensor Return
Equipment Ground
Temperature Sensor 12
34
56
78
91010
11111212
13131414
15151616
1718
19
BE
MC
8
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